Method erase

src/ifcparse/map_variant.h:142–150

    }

    size_t erase(const key_type& key) {
        return std::visit([&key](auto m) -> size_t {
            if constexpr (std::is_same_v<std::decay_t<decltype(m)>, std::monostate>) {
                return size_t(0);
            } else {
                return m->erase(key);
            }
        }, map_);
    }

    size_t erase(const iterator& it) {
        return std::visit([&it](auto m) -> size_t {